Flamestrike gem odd behavior

The flamestrike gem is doing some odd things. The initial damage does not seem to happen as often as the proc animation would suggest. Also the combat log gets spammed about flamstrike being refreshed on mobs. Sometimes my damage meter doesnt even catch flamestrikes damage at all, which makes me think it not only didnt do its initial damage, but it refreshed so much that it never got a tick of ground damage off or something. Very weird stuff.